/**
* Reads the response-content.
*
* @param bool $stream_to_file If TRUE, the content will be streamed diretly to the temporary file and
* this method will not return the content as a string.
* @param int &$error_code Error-code by reference if an error occured.
* @param &string &$error_string Error-string by reference
* @param &string &$document_received_completely Flag indicatign whether the content was received completely passed by reference
*
* @return string The response-content/source. May be emtpy if an error ocdured or data was streamed to the tmp-file.
*/
protected function readResponseContent($stream_to_file = false, &$error_code, &$error_string, &$document_received_completely)
{
$this->content_bytes_received = 0;
// If content should be streamed to file
if ($stream_to_file == true) {
$fp = @fopen($this->tmpFile, "w");
if ($fp == false) {
$error_code = PHPCrawlerRequestErrors::ERROR_TMP_FILE_NOT_WRITEABLE;
$error_string = "Couldn't open the temporary file " . $this->tmpFile . " for writing.";
return "";
}
}
// Init
$source_portion = "";
$source_complete = "";
$document_received_completely = true;
$document_completed = false;
$gzip_encoded_content = null;
// Resume data-transfer-time benchmark
PHPCrawlerBenchmark::start("data_transfer_time");
while ($document_completed == false) {
// Get chunk from content
$content_chunk = $this->readResponseContentChunk($document_completed, $error_code, $error_string, $document_received_completely);
$source_portion .= $content_chunk;
// Check if content is gzip-encoded (check only first chunk)
if ($gzip_encoded_content === null) {
if (PHPCrawlerUtils::isGzipEncoded($content_chunk)) {
$gzip_encoded_content = true;
} else {
$gzip_encoded_content = false;
}
}
// Stream to file or store source in memory
if ($stream_to_file == true) {
@fwrite($fp, $content_chunk);
} else {
$source_complete .= $content_chunk;
}
// Decode gzip-encoded content when done with document
if ($document_completed == true && $gzip_encoded_content == true) {
$source_complete = $source_portion = PHPCrawlerUtils::decodeGZipContent($source_complete);
}
// Find links in portion of the source
if ($gzip_encoded_content == false && $stream_to_file == false && strlen($source_portion) >= 200000 || $document_completed == true) {
if (PHPCrawlerUtils::checkStringAgainstRegexArray($this->lastResponseHeader->content_type, $this->linksearch_content_types)) {
PHPCrawlerBenchmark::stop("data_transfer_time");
$this->LinkFinder->findLinksInHTMLChunk($source_portion);
$source_portion = substr($source_portion, -1500);
PHPCrawlerBenchmark::start("data_transfer_time");
}
}
}
if ($stream_to_file == true) {
@fclose($fp);
}
// Stop data-transfer-time benchmark
PHPCrawlerBenchmark::stop("data_transfer_time");
$this->data_transfer_time = PHPCrawlerBenchmark::getElapsedTime("data_transfer_time");
return $source_complete;
}